[✨ feature] Adding issues

[Fredkiss3]

Is your feature request related to a problem? Please describe.

The user should be able to add issues to the project, with labels and only be able to assign themself.

Describe the solution you'd like

• add issue from different templates (take the one from this repo) or from blank (later)
• the issue author should be able to preview the body
• Rich and automatic styling of markdown
• No image or video upload since we don't want people to abuse the system, instead link external images & videos with either their tag or markdown symbol
• emoji dropdown
• User mention dropdown
• Slash commands dropdown
• Issue mention dropdown
• Possiblity to only self assign oneself
• Can edit labels at your convenience
• The title should support a limited set of markdown (only code, bold, italic and linethrough)

Describe alternatives you've considered

Nope.

Additional context

• See https://ariakit.org/examples/combobox-textarea for autocompletion on the markdown editor
• I should add admin permissions to reassign issues if possible.

Image for inspiration :

Emoji dropdown :

Mention dropdown :

Commands dropdown :

Issues mentions :

• Are you willing to make a PR for this ?